Required:
Vials of Water
MOST of your potions require vials of water to be mixed with a herb, although there are a few exceptions like "Bastion potion" that uses a Vial of Blood instead . The Skill store trader will sell vials of water to you for 25 gold each.
Useful Item:
Amulet of Chemistry
The amulet of chemistry makes the loss of training Herblore slightly less if you do not have the "Mix Master" relic. Every time you create a potion, there is a 5% chance it turns into a four-dose.
Weekend events (enabled at 8:00 AM server time) provide a 1.25x experience boost
10% to all experience gained inside Donator Zone
10% to all experience gained for 12 hours after using ::vote
On occasion, you will get a Herblore daily skilling task. Completing this task will grant a nice chunk of xp in Herblore. The higher your donator rank is, the more skilling tasks you are offered.
Spoiler for Stores and more:
Spoiler for Reccomended levelling guide: